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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b22933f4346d5ff4d949a5033f8feaf23a76d87496c53d06f9cce28865c462' 
  AND token = 'al4iLG/zlZAsxQYOCElLSEAu9SnoWBetVp8eYzG4qLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}